Noun “재개발” (“재- (re-)”＋“개발 (development)”) and verb “재개발하다”

Conjugation “-ᆫ다고”

Noun (noun adjunct) “철거”

Noun “용역”

“Labor service” by definition, but often means “manual workers” as well.

Suffix “들”

A suffix denoting the plurals of nouns. “-s.”

Marker “이”

A subject marker.

Verb “들이닥치다”

“To arrive, come closer, especially suddenly or erratically.” Implies harshness. “To show up” would be a good translation.

Ending conjugation “-더라고”

Used when you describe something in retrospect.
“What I saw/realized/felt/learned was that; seemingly.”
Though I couldn't find such sense from the dictionary, this is used massively in casual conversations.

The third one

“중요한 단서는 쓰레기통의 옆에 두는 거라고.”

“An important clue is what you put at the side of a trash can.”

“You'd want to put your crucial clue next to your trash can.”

(to make it look not so)

I couldn't recognize his “중요한” as his /ng/ and /n/ sounded a bit weak. I was like, “추요한다 해서는?” “추요한 단서는?” Now that I catch it, I'm writing this.

Adjective “중요하다”

“Of great importance.”

Noun “단서”

“Clue; a piece of evidence or information used in the detection of a crime or solving of a mystery.”

Marker (copula) “는”

“Is.”

Noun “쓰레기통” “쓰레기 (trash)”＋“통 (bin)”

“Trash can.”

Marker “의”

“Of.”

Noun “옆”

“Side; a position to the left or right of an object, place, or central point.”

Marker “에”

“At” or “on.”

Verb “두다”

“To put something down.”

Noun “거”

The informal or spoken variation of the word “것,” meaning a “thing.”

Ending conjugation “-라고”

Used in the “해” register (the most casual speech level), to tell one's thought or opinion with a slight emphasizing or confidence.

I recognized the movie from the second and third clip. 신과 함께-인과 연, or Along with the Gods: The Last 49 Days. And you know what? It's on Netflix. And you know what even more? Netflix provides Korean subtitles for this movie for its service in Korea.

So I went through the movie to find a scene where people fight, and located the sentence in question around 00:26:23. The subtitle reads:

새끼, 똥폼은, 씨...

I hear "이 새끼" with a determiner "이", but maybe that's a minor (and natural enough) addition by the actor, thus not reflected in the script-based subtitle.